Art of packaging



May 8, 1945. P. B. HULTKRANS ART OF PACKAGING Filed Sept. 23, 1942 'A clear conception of the several Patented May 8, 1945 ART OF raoxaemo Paul B Hultkrans, shorewoodriwis assign or; to a Milprint, Inc., Milwaukee, Wis a corporaticn of- Delaware Application September 23, 1 942,:serie1 No. 459,397

.2 Claims. (or 93-3) The present invention relates to improvements in the art of p'ackaging d verse commodities in batches, and relates more specifically to improvements in the construction of composite wrappers and to an improved method of producing such.

wrappers and packages utilizingtli same. An object of the invention is'lt'o' and useful composite wrapper forbat'c'hes' of com-- modity, and an improved method'of producing the composite wrappers. f

It has heretofore been proposed to provide composite wrappers each consisting of an outer relatively rigid box or carton lined with thinner and more flexible sheet material, for various purposes, and such composite assemblages have gone into rather extended commercial use. While it has also been attempted in the, past, toutilize highly flexible bags as liners for the stifierboxes, considerable difiiculty has been encountered in causing all portions of the bag. liners to hug'the carton interiors, and also in retainingthe liners in place and properly positioned within the. outer shells.

The present invention therefore contemplates the provision of an improved process whereby relatively stifi cup-shaped cartons can be quickly and effectively lined with snug-fitting liner bags, and in such manner that the liners will be positively retained in proper position within the cartons. p r

Another specific object of my present invention is to provide a greatly improved compound wrapper assemblage of the type embodyingan outer rigid shell lined with more flexible sheeting.

, A further'specific object of .this invention is to provide a simplified and more efficient method of packing batches of diverse materials within a flexible bagsnug-ly confined within a stiifer outer casing.

Still another'object of the inventionis to provide an improved mode of attaching a bag liner within a'prismatic carton or the like, so that the bag and carton may be readily loaded and ultimately most efiectively sealed, These and other objects and advantages of my invention will be apparent from the following detailed description .of the improved method, article and apparatus.

l Steps .volved in the improved method, and of the construction of the improved wrapper, may be had by referring to the drawing accompanying and forming a part of this specification wherein like "vide a new reference characters designate the same or similar'parts in the various views. i v i Fig; l is a somewhat diagrammatic part sectional view'depicting the initial step of' the' improved method of producing composite wra v pers; H

Fig.2 is a similar view illustrating the second step of the improved method; 3 is another similar view showing the initial part of the third'step of the method;

' Fig. 4 is still another similar view depicting. the third step carried to its conclusion;,

" Fig'g5 is a part' sectional side elevation 'of a commodity laden improved-composite wrapper sealed without the aid of a cover; and iv r Fig; 6 is a similar elevation' of a filled com posite wrapper sealed with the aid of a" covert Whiletheinvention has been shownan'jd dejscribed herein as being applied toe-composite package wrapper having a rigidjcylindrical card board carton linedwith ahighly-flexible--trazisparent bag, it is not my desire or intent to therei by unnecessarily restrict the scope or ut'Iity' 'of the improvement. Y 1 "f With specific reference to the-drawing, the several'successive steps of the improved process are depicted in Figs. 1 to 4- inclusive, and while the method of producing the improved composite package wrappers maybe carried on without the aid of special equipment, exploitation thereof is facilitated by utilizingan upright tubular or-hollow cylindrical form 8 fixedly secured to a lower stationary support 9 and havinga low-. ermost compressed air inlet opening l0 communicable with any suitable source, and also being provided with an open upper end.v Thefouter relatively rigid boxes or cylindrical cartonsll are of well known construction, being. formed'of cardboard or the like; and the liner bagsl2 may be formed of flexible but rather strong "and,

somewhat elastic sheet material suchas cellulose film or rubber compound sheeting and are preferably about twice as long as the'depth of the cartons H. The cup-shaped cylindrical cartons II are preferably provided with external'adhesive areas l3 adjacent to the openings thereof, and may also be provided with snug fitting closurecaps l4 formed of cardboard" or the like,

see Fig. 6. The flexible liner bags |2 are infact much thinner in comparison with the cartons I I,

than shown on the drawing, this distortion having' been introduced for the sake of clearness.

In carrying on my improved packagmg'method,

the flexible liner bag I2 is first positioned as illustrated in Fig. 1, in inverted positionwith its D fter 'er d' b and w e he mm i e' aresealedas inflig. o the .use qf ania mouth portion slipped downwardly over the upright hollow cylindrical form 8, and its bottom} portion looselyinserted within thev inverted cupshaped prismatic carton; II. After the'severall" elements have been thus initially positioned, air under pressure may be admitted to the interior of,

the form 8 through the lower inlet opening III, as indicatedin Fig. 2, and this compressed air will lill the bag I2 and-will causethepo'rti'on thereof with in the carton I I tohug the carton interior except for the bottom corners I5. The excess compressed A air will escape downwardly from'within'the in=- verted carton. II throughthe mouthuopening thereof, and. will flow through the depending mouth portion of the bag 1 l2 aflongfthe exterioryof properly retain the wrapper parts in desired position. I v

From the foregoing detailed description it will beapparent that my present invention provides an improved composite wrapper assemblage and an improved method'of effectively producing the assemblages and the completed packages in rapid succession. The-flexible inner liner bags l2 are snugly applied to all internal smtfaces of the] 1 prismatic cup-shaped relatively rigid outer cartons I I, and the elements are maintained in prop- -'-erly assembled position primarily by means of the reverse folds I'l snugly coacting with the car ton exterior. This reverse folding of the outthe casing or form 8, eventually'es'capmg' from the bag mouth to theatmosphere, as indicated by the arrows.

' When the annular iexpanded bulge '01 part It has been'produced and while-lair runder zprcssure continues. to.,;escape through-the mouth. of the bag :12, the :outer carton H should be grfidually a lowered over the upper end of the form 8 as s de-j I rpicted in; Fig; .-,3.- .The downwardly advancing lower open and ofrtherrigidvcarton 4H -Wi1l-: then coactgwith thelenlarged medial part I 6 of the-bag I2, andwvill fold thismedial bagiportionaupwardly or reerwardly around the 1 exterior :of the carton II as illustratedrin'Fig 3. Thelength of'the fold 1 .willlincreas'e as the i-lolwering of the carton I I proceeds, and the mouth portion-bf the bag will constantly decrease in "length until :it finally lsurrounds the intervening :annulahfold .11 sand :the

bag ;mouth'. is positioned adjacent to the carton beslipped upwardly to the position IshbwnrinFig.

.4. v,VI/Ehenthe fold 11:15 thus formed, it initially vengages the adhesive-area -I3-onithe exterioriofthe ,carton-II rand becomes permanently attached :thereto, -and when theba ilined'cartonfl As. this escaping compressed. airzleaves. the carton opening, it expands or swells the medial part I6 of the flexible bag I2 directly adjoining T the carton :opening as clearing shown in .Fig, -2.

- .wardlyprofiectingymouth portions of the bags [2, "also withdraws these mouth portions from the carton opening, thereby facilitating, loading of thegbag; lined cartons, while permitting convenient closure and sealing of the commodity laden'c'ontainers. The improved assembly meth- ;od may .be carniedjon withoutthe aid .of special equipment ,by merely: inserting the bag 12 .within "a .carton @I I ,,-blowing--into ,the ,-ba g";mouth to .form faqmedial bulg edlfi, and advancing the open earton 'end toward the bag ,mouth. Sanitar y and rapidv production, .Qf' .the;. successive composite w a persislhowever enhanced by utilizing simple apparatus such as .s'howinand described, in ex-- ploiting the mama, and this .l'lype of equipment has proven highly satisfactoryin actual use. In

,order to secure best results, the external diam- "eter of v the .forrnell should be only slightly "less opening whereupon the bag imouth portion'jmayally lowered to the position indicated inFig. 24, the

peripheral portion of the bag bottom will be 3 -driven into the corners I25 at the lbottomrofthe v carton I I- by the upper end ,ofthelformlffl to thereby stretchvthe liner :bag il 2 intoflsnugiien agagementwith all portions of the "carton rinte t e mp te' rap yhas;iheent completed, .it bev withdrawn ,irom the fixed form 8 and set in upright positionas-zin 1 ,555.15

,and d Each tr thelaaglined qcartuns .-I.I ,;may t e b loade w th; mm d tyd a; whereu the upper opening may be closediand sealed :in

any desired manner, In -.cases-where -air1tight I closure .is not necessary the gmouth martian -rflf applying-air pressure to the interior of the.;bag td-cause, the inserted- "portionthereof 'to snugly 103 t fs lds an 1Qi ed'int :a. t a upper .twist I? as shown :5, and .a; aBlQSllf fi cap I4 may thereafter be applied ttosthenpper endjo'f the cartontlsover theptwist 1:9. 7 ngcases where hermeticsealingeisdesired, "the cap Haney be applied so that the reap-flange l flsnugly dithanvthe.internalfiiameterof .the liner bag I2 and carton 11,50 that thefmedialpart 1B of the bag will be bulged.to';al'cor siderabl.e extent as soon \asithe bag'fis inflated and "the, excess air, escapes.

'Thecartons'll and bac jlzmay Obviously be of anyldesired size and j's'hape', 'but'theabags [-2 should preferably be sufficiently strong, elastic and flexible to. .permit, formation 'o'f the bulges I6 and folds 'I'I withoutfte'aring the stock.

- .jlt shouldnbe understood that itis not desired end portion of'the bag to project'a-considerable distance outwardly beyond-'the-carton' opening,

aengagethe :cairton interior while also tcausin'g' the outwardly projecting portion thereof it'ozex and'outwardly racros'sgthe .rim ref ithe 2113113011 opening, then; moving 'the- :carton toward the open 7 nd of the liner .baggto cause the-medial @bag ,por-

. l T265 rectly engagesthetold-g l-fl, andythe mouth; portion I of 5; the bag I 2 may thereafter;hestrippedeyer, the

exterior of thefiangelflandg I c v ltral-external twist Illor otheiavme;seale d.,,g0th r mo e "0 fina rclosing th ac a e may he. r im in -S rI 3 .is not ,necessary, and while such adhesive, rata 6f th l r th t ari-i u am 1 .-.e 's riia .ieer io lt t Fi ld. re r are r ia diq r ar ly s t produce concentric,annular',portions, around the open end of the canton, permanently attaching an annular ring 'of'the rearwardly folded portion 7 of thebag to the ,adjacent'carton wall andtiipping'theforwardly directed portion considerably beyond the rim of thecart'on opening, inserting commoditylwitliin the bag and carton, andthere- "after foldingthe: protruding mouth portion of the ilining bag 1 inwardly 1 across the carton rim and :sealing' the isame' withinthe =r im or the' carton --;onening..

2.'The method of packing, which comprises, loosely inserting the closed bottom of a flexible bag within a relatively rigid carton of approximately one-half the length and of slightly less transverse cross-section than the bag so as to cause the open end ortion of the bag to project a considerable distance outwardly beyond the carton opening, applying air pressure to the interior of the bag to cause the inserted portion thereof to snugly engage the carton interior while also causing the outwardly projecting portion thereof to expand outwardly across the rim of the carton opening, then moving the' carton toward the open end of the liner bag to Cause the medial bag portion to fold rearwardly and forwardly so as to produce concentric annular portions around the open end of the carton, permanently attaching an annular ring of the rearwardly folded portion of the bag to the adjacent carton wall and stripping the forwardly directed por tion considerably beyond the rim of the carton opening, inserting commodity within the bag and carton, thereafter folding the protruding mouth portion of the lining bag inwardly across the carton rim and sealing the same within the rim of the carton opening, and finally applying a snug fitting cover to the concentric external folds of the bag which surround the initially open end of the carton.

PAUL B. HULTKRANS. 

